diff --git a/Tzkt.Api/Extensions/ModelBindingContextExtension.cs b/Tzkt.Api/Extensions/ModelBindingContextExtension.cs
index 06bbbccac..1f2a805d9 100644
--- a/Tzkt.Api/Extensions/ModelBindingContextExtension.cs
+++ b/Tzkt.Api/Extensions/ModelBindingContextExtension.cs
@@ -453,6 +453,56 @@ public static bool TryGetContractKind(this ModelBindingContext bindingContext, s
             return true;
         }
 
+        public static bool TryGetContractKindList(this ModelBindingContext bindingContext, string name, ref bool hasValue, out List<int> result)
+        {
+            result = null;
+            var valueObject = bindingContext.ValueProvider.GetValue(name);
+
+            if (valueObject != ValueProviderResult.None)
+            {
+                bindingContext.ModelState.SetModelValue(name, valueObject);
+                if (!string.IsNullOrEmpty(valueObject.FirstValue))
+                {
+                    var rawValues = valueObject.FirstValue.Split(',', StringSplitOptions.RemoveEmptyEntries);
+
+                    if (rawValues.Length == 0)
+                    {
+                        bindingContext.ModelState.TryAddModelError(name, "List should contain at least one item.");
+                        return false;
+                    }
+
+                    hasValue = true;
+                    result = new List<int>(rawValues.Length);
+
+                    foreach (var rawValue in rawValues)
+                    {
+                        if (rawValue == ContractKinds.Asset)
+                        {
+                            hasValue = true;
+                            result.Add(2);
+                        }
+                        else if (rawValue == ContractKinds.SmartContract)
+                        {
+                            hasValue = true;
+                            result.Add(1);
+                        }
+                        else if (rawValue == ContractKinds.Delegator)
+                        {
+                            hasValue = true;
+                            result.Add(0);
+                        }
+                        else
+                        {
+                            bindingContext.ModelState.TryAddModelError(name, "List contains invalid contract kind.");
+                            return false;
+                        }
+                    }
+                }
+            }
+
+            return true;
+        }
+
         public static bool TryGetVoterStatus(this ModelBindingContext bindingContext, string name, ref bool hasValue, out int? result)
         {
             result = null;
diff --git a/Tzkt.Api/Parameters/Binders/ContractKindBinder.cs b/Tzkt.Api/Parameters/Binders/ContractKindBinder.cs
index 8d2d95431..fde954019 100644
--- a/Tzkt.Api/Parameters/Binders/ContractKindBinder.cs
+++ b/Tzkt.Api/Parameters/Binders/ContractKindBinder.cs
@@ -22,6 +22,12 @@ public Task BindModelAsync(ModelBindingContext bindingContext)
             if (!bindingContext.TryGetContractKind($"{model}.ne", ref hasValue, out var ne))
                 return Task.CompletedTask;
 
+            if (!bindingContext.TryGetContractKindList($"{model}.in", ref hasValue, out var @in))
+                return Task.CompletedTask;
+
+            if (!bindingContext.TryGetContractKindList($"{model}.ni", ref hasValue, out var ni))
+                return Task.CompletedTask;
+
             if (!hasValue)
             {
                 bindingContext.Result = ModelBindingResult.Success(null);
@@ -31,7 +37,9 @@ public Task BindModelAsync(ModelBindingContext bindingContext)
             bindingContext.Result = ModelBindingResult.Success(new ContractKindParameter
             {
                 Eq = value ?? eq,
-                Ne = ne
+                Ne = ne,
+                In = @in,
+                Ni = ni
             });
 
             return Task.CompletedTask;
diff --git a/Tzkt.Api/Parameters/ContractKindParameter.cs b/Tzkt.Api/Parameters/ContractKindParameter.cs
index f271a9613..299db486e 100644
--- a/Tzkt.Api/Parameters/ContractKindParameter.cs
+++ b/Tzkt.Api/Parameters/ContractKindParameter.cs
@@ -1,4 +1,5 @@
-using Microsoft.AspNetCore.Mvc;
+using System.Collections.Generic;
+using Microsoft.AspNetCore.Mvc;
 using NJsonSchema.Annotations;
 
 namespace Tzkt.Api
@@ -19,9 +20,27 @@ public class ContractKindParameter
         /// **Not equal** filter mode. \
         /// Specify a contract kind to get items where the specified field is not equal to the specified value.
         /// 
-        /// Example: `?type.ne=delegator_contract`.
+        /// Example: `?kind.ne=delegator_contract`.
         /// </summary>
         [JsonSchemaType(typeof(string))]
         public int? Ne { get; set; }
+
+        /// <summary>
+        /// **In list** (any of) filter mode. \
+        /// Specify a comma-separated list of contract kinds to get items where the specified field is equal to one of the specified values.
+        /// 
+        /// Example: `?kind.in=smart_contract,asset`.
+        /// </summary>
+        [JsonSchemaType(typeof(List<string>))]
+        public List<int> In { get; set; }
+
+        /// <summary>
+        /// **Not in list** (none of) filter mode. \
+        /// Specify a comma-separated list of contract kinds to get items where the specified field is not equal to all the specified values.
+        /// 
+        /// Example: `?kind.ni=smart_contract,asset`.
+        /// </summary>
+        [JsonSchemaType(typeof(List<string>))]
+        public List<int> Ni { get; set; }
     }
 }
diff --git a/Tzkt.Api/Repositories/AccountRepository.cs b/Tzkt.Api/Repositories/AccountRepository.cs
index 885942fe3..5c1918a53 100644
--- a/Tzkt.Api/Repositories/AccountRepository.cs
+++ b/Tzkt.Api/Repositories/AccountRepository.cs
@@ -3031,11 +3031,11 @@ IEnumerable<string> GetTzips(int? value)
             if (value == null || value == 0) return null;
             var res = new List<string>(1);
 
-            if (((int)value & (int)Data.Models.Tzip.FA2) > 0)
+            if (((int)value & (int)Data.Models.Tzip.FA2) == (int)Data.Models.Tzip.FA2)
                 res.Add("fa2");
-            else if (((int)value & (int)Data.Models.Tzip.FA12) > 0)
+            else if (((int)value & (int)Data.Models.Tzip.FA12) == (int)Data.Models.Tzip.FA12)
                 res.Add("fa12");
-            else if (((int)value & (int)Data.Models.Tzip.FA1) > 0)
+            else if (((int)value & (int)Data.Models.Tzip.FA1) == (int)Data.Models.Tzip.FA1)
                 res.Add("fa1");
 
             return res;
diff --git a/Tzkt.Api/Repositories/OperationRepository.cs b/Tzkt.Api/Repositories/OperationRepository.cs
index 747776dfb..ef5d8ea83 100644
--- a/Tzkt.Api/Repositories/OperationRepository.cs
+++ b/Tzkt.Api/Repositories/OperationRepository.cs
@@ -4409,13 +4409,13 @@ public async Task<IEnumerable<TransactionOperation>> GetTransactions(
                     res = res.Where(x => x.Parameters != null);
                 if (parameters.As != null)
                 {
-                    var pattern = $"^{parameters.As.Replace("%", ".*")}$";
-                    res = res.Where(x => System.Text.RegularExpressions.Regex.IsMatch(x.Parameters, pattern));
+                    var pattern = $"^{parameters.As.Replace("%", ".*").Replace("[", "\\[").Replace("]", "\\]").Replace("{", "\\{").Replace("}", "\\}")}$";
+                    res = res.Where(x => x.Parameters != null && System.Text.RegularExpressions.Regex.IsMatch(x.Parameters, pattern));
                 }
                 if (parameters.Un != null)
                 {
-                    var pattern = $"^{parameters.Un.Replace("%", ".*")}$";
-                    res = res.Where(x => !System.Text.RegularExpressions.Regex.IsMatch(x.Parameters, pattern));
+                    var pattern = $"^{parameters.Un.Replace("%", ".*").Replace("[", "\\[").Replace("]", "\\]").Replace("{", "\\{").Replace("}", "\\}")}$";
+                    res = res.Where(x => x.Parameters != null && !System.Text.RegularExpressions.Regex.IsMatch(x.Parameters, pattern));
                 }
 
                 if (sort?.Asc != null)
diff --git a/Tzkt.Api/Utils/SqlBuilder.cs b/Tzkt.Api/Utils/SqlBuilder.cs
index 5753d2209..022ca8927 100644
--- a/Tzkt.Api/Utils/SqlBuilder.cs
+++ b/Tzkt.Api/Utils/SqlBuilder.cs
@@ -107,6 +107,18 @@ public SqlBuilder Filter(string column, ContractKindParameter kind)
             if (kind.Ne != null)
                 AppendFilter($@"""{column}"" != {kind.Ne}");
 
+            if (kind.In != null)
+            {
+                AppendFilter($@"""{column}"" = ANY (@p{Counter})");
+                Params.Add($"p{Counter++}", kind.In);
+            }
+
+            if (kind.Ni != null && kind.Ni.Count > 0)
+            {
+                AppendFilter($@"NOT (""{column}"" = ANY (@p{Counter}))");
+                Params.Add($"p{Counter++}", kind.Ni);
+            }
+
             return this;
         }